diff --git a/plugin/vimux.vim b/plugin/vimux.vim
index c62479d..d4bddb9 100644
--- a/plugin/vimux.vim
+++ b/plugin/vimux.vim
@@ -3,7 +3,7 @@ if exists("g:loaded_vimux") || &cp
 endif
 let g:loaded_vimux = 1
 
-command -nargs=1 VimuxRunCommand :call VimuxRunCommand(<args>)
+command -nargs=2 VimuxRunCommand :call VimuxRunCommand(<args>)
 command VimuxRunLastCommand :call VimuxRunLastCommand()
 command VimuxCloseRunner :call VimuxCloseRunner()
 command VimuxZoomRunner :call VimuxZoomRunner()